Upgrading the Macheist free NanoBundle to Twitterrific v4 (Mac)

How do I upgrade my copy of Twitterrific v3 from the
Macheist's free Nanobundle to v4? The
Iconfactory's registration database doesn't contain any records for
those who acquired the free NanoBundle and so the online form to
look up serial numbers at the Iconfactory won't work.

The Twitterrific 3.x serial number that Macheist issued
NanoBundle owners is still valid however and is necessary when
upgrading to version 4. Twitter changed the login method at the end
of June 2011, version 4.2 released in early June 2011 will work
with this new requirement. NO previous version of
Twitterrific can log in to Twitter!

NanoBundle owners can purchase either from the Mac App Store, or
directly from Iconfactory. Instructions are below:

MAC APP STORE: The paid version of Twitterrific from the Mac App
Store is available for USD $4.99 and no upgrade information is
required for purchase. This is a full ad-free version. More
information: